tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head: 7efcac7603953bb58d80041f410b079378b5174c
commit: 6c08191286995b0594d2ecf12fe7fca3cea1a5ca [15692/21625] io_uring: add support for pre-mapped user IO buffers
config: arm64-randconfig-r123-20240125 (https://download.01.org/0day-ci/archive/20240210/202402100007.deukWjpN-lkp@…)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240210/202402100007.deukWjpN-lkp@…)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp(a)intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402100007.deukWjpN-lkp@intel.com/
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
In file included from include/linux/poll.h:12,
from include/linux/ring_buffer.h:7,
from include/linux/trace_events.h:6,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:86,
from fs/io_uring.c:32:
In function '_copy_from_user',
inlined from 'copy_from_user' at include/linux/uaccess.h:144:7,
inlined from 'io_copy_iov.isra' at fs/io_uring.c:1457:7:
>> include/linux/uaccess.h:112:17: warning: 'ciov' may be used uninitialized [-Wmaybe-uninitialized]
112 | kasan_check_write(to, n);
| ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/compiler.h:251,
from include/linux/kernel.h:10,
from fs/io_uring.c:29:
include/linux/kasan-checks.h: In function 'io_copy_iov.isra':
include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here
7 | void kasan_check_write(const volatile void *p, unsigned int size);
| ^~~~~~~~~~~~~~~~~
fs/io_uring.c:1454:37: note: 'ciov' declared here
1454 | struct compat_iovec ciov;
| ^~~~
In function '_copy_from_user',
inlined from 'copy_from_user' at include/linux/uaccess.h:144:7,
inlined from 'io_uring_setup' at fs/io_uring.c:1960:6:
include/linux/uaccess.h:112:17: warning: 'p' may be used uninitialized [-Wmaybe-uninitialized]
112 | kasan_check_write(to, n);
| ^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/kasan-checks.h: In function 'io_uring_setup':
include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here
7 | void kasan_check_write(const volatile void *p, unsigned int size);
| ^~~~~~~~~~~~~~~~~
fs/io_uring.c:1956:32: note: 'p' declared here
1956 | struct io_uring_params p;
| ^
In file included from include/linux/uaccess.h:11:
In function 'set_fs',
inlined from 'io_sq_wq_submit_work' at fs/io_uring.c:1114:3:
arch/arm64/include/asm/uaccess.h:59:12: warning: 'old_fs' may be used uninitialized [-Wmaybe-uninitialized]
59 | if (IS_ENABLED(CONFIG_ARM64_UAO) && fs == KERNEL_DS)
| ^
fs/io_uring.c: In function 'io_sq_wq_submit_work':
fs/io_uring.c:1074:22: note: 'old_fs' was declared here
1074 | mm_segment_t old_fs;
| ^~~~~~
vim +/ciov +112 include/linux/uaccess.h
d597580d373774 Al Viro 2017-03-20 104
d597580d373774 Al Viro 2017-03-20 105 #ifdef INLINE_COPY_FROM_USER
d597580d373774 Al Viro 2017-03-20 106 static inline unsigned long
d597580d373774 Al Viro 2017-03-20 107 _copy_from_user(void *to, const void __user *from, unsigned long n)
d597580d373774 Al Viro 2017-03-20 108 {
d597580d373774 Al Viro 2017-03-20 109 unsigned long res = n;
9c5f6908de03a4 Al Viro 2017-06-29 110 might_fault();
4983cb67a383a7 Linus Torvalds 2019-02-14 111 if (likely(access_ok(from, n))) {
9c5f6908de03a4 Al Viro 2017-06-29 @112 kasan_check_write(to, n);
d597580d373774 Al Viro 2017-03-20 113 res = raw_copy_from_user(to, from, n);
9c5f6908de03a4 Al Viro 2017-06-29 114 }
d597580d373774 Al Viro 2017-03-20 115 if (unlikely(res))
d597580d373774 Al Viro 2017-03-20 116 memset(to + (n - res), 0, res);
d597580d373774 Al Viro 2017-03-20 117 return res;
d597580d373774 Al Viro 2017-03-20 118 }
d597580d373774 Al Viro 2017-03-20 119 #else
d597580d373774 Al Viro 2017-03-20 120 extern unsigned long
d597580d373774 Al Viro 2017-03-20 121 _copy_from_user(void *, const void __user *, unsigned long);
d597580d373774 Al Viro 2017-03-20 122 #endif
d597580d373774 Al Viro 2017-03-20 123
:::::: The code at line 112 was first introduced by commit
:::::: 9c5f6908de03a4f52ba7364b11fcd6116225480c copy_{from,to}_user(): move kasan checks and might_fault() out-of-line
:::::: TO: Al Viro <viro(a)zeniv.linux.org.uk>
:::::: CC: Al Viro <viro(a)zeniv.linux.org.uk>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head: 7efcac7603953bb58d80041f410b079378b5174c
commit: 725ee753b5064f03287858bc346d883b8f39319a [13023/21625] bdi: fix use-after-free for the bdi device
config: arm64-randconfig-r123-20240125 (https://download.01.org/0day-ci/archive/20240209/202402090649.euI3JhvL-lkp@…)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240209/202402090649.euI3JhvL-lkp@…)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp(a)intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402090649.euI3JhvL-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> block/blk-cgroup.c:478:19: sparse: sparse: incompatible types in comparison expression (different address spaces):
block/blk-cgroup.c:478:19: sparse: struct rcu_device [noderef] __rcu *
block/blk-cgroup.c:478:19: sparse: struct rcu_device *
block/blk-cgroup.c:816:5: sparse: sparse: context imbalance in 'blkg_conf_prep' - wrong count at exit
block/blk-cgroup.c:1794: warning: Function parameter or member 'q' not described in 'blkcg_schedule_throttle'
block/blk-cgroup.c:1794: warning: Function parameter or member 'use_memdelay' not described in 'blkcg_schedule_throttle'
block/blk-cgroup.c:1819: warning: Function parameter or member 'blkg' not described in 'blkcg_add_delay'
block/blk-cgroup.c:1819: warning: Function parameter or member 'now' not described in 'blkcg_add_delay'
block/blk-cgroup.c:1819: warning: Function parameter or member 'delta' not described in 'blkcg_add_delay'
vim +478 block/blk-cgroup.c
472
473 const char *blkg_dev_name(struct blkcg_gq *blkg)
474 {
475 /* some drivers (floppy) instantiate a queue w/o disk registered */
476 struct rcu_device *rcu_dev;
477
> 478 rcu_dev = rcu_dereference(blkg->q->backing_dev_info->rcu_dev);
479 if (rcu_dev)
480 return dev_name(&rcu_dev->dev);
481 return NULL;
482 }
483 EXPORT_SYMBOL_GPL(blkg_dev_name);
484
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0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki